| // RUN: %target-swift-frontend %s -emit-ir |
| |
| class Expression<A, R> { |
| typealias Arg = A |
| typealias Ret = R |
| subscript(x: Arg) -> Ret! { return nil } |
| } |
| class Op<A, R> : Expression<A, R> { |
| typealias OpType = (Arg) -> Ret |
| let op: OpType |
| init(op: @escaping OpType) { |
| self.op = op |
| super.init() |
| } |
| } |
| |
| class BinaryOp<A1, A2, R> : Op<((A1, A2)), R> { |
| override init(op: @escaping OpType) { |
| super.init(op: op) |
| } |
| override subscript(x: Arg) -> Ret! { |
| return op(x) |
| } |
| } |
| let add = BinaryOp<Int, Int, Int> { return $0.0 + $0.1 } |
| print(add[(1,1)]) |
